Water scoop for boats



April 1942- H. SCOTT-PAINE 2,281,459

WATER SCOOP FOR BOATS Filed April 24, 1940 Patented Apr. 28, 1942,oFFlcE WATER SCOOP FOR BOATS Hubert Scott-Paine, Southampton, EnglandApplication April 24, 1940, Serial No. 331,319 In Great Britain June 5,1939 1 Claim.

This invention concerns improvements in or relating to water scoops forboats for the purpose of conducting water into and out of the boat.

The invention comprises, in or fora boat, particularly a high-speedboat, a water scoop comprising a pipe having an oblique flange to securethe scoop to the boat hull, and an open end, slightly less oblique thanthe flange, extending through the flange from a point in or near thegeneral plane of the flange.

The invention is particularly applicable to a high-speed boat having ahard chine hull, in which case the scoop is arranged on the V-shapedbottom of the hull at a part which is covered by a streamlined flow ofwater at all speeds of the boat. The scoop may be used as a pressurescoop, in which case the pipe is arranged to slope upwardly aft from theflange so that the edge or lip of the pipe which projects into the waterfaces the flow of water when the boat is moving forward and directs thewater within the boat. Alternatively, the scoop may be used as a suctionscoop, in which case the pipe slopes upwardly forward of the boat sothat the scoop operates as a self-bailer fltting drawing water fromwithin the boat.

In order to provide a construction which offers a minimum of resistanceto the passage of the boat through the water, the scoop is preferablyprovided with a streamlined fairing between the projecting end of thepipe-opening and the flange. In addition, the pipe is smoothly curvedupwardly from its open end, and the wall of the pipe, opposite itsprojecting edge or lip, may be curved to meet the flange tangentially soas to facilitate a smooth flow of water through the pipe.

In the accompanying drawing which illustrates one embodiment of thisinvention:

Figure 1 is an elevation in section of the scoop,

Figure 2 is an underside view of the scoop,

Figure 3 is a section on the line 33 of Figure 1, and

Figure 4 is a section on the line 4-4 of Figure 1.

Like reference characters indicate like parts throughout the drawing.

Referring to the drawing, the scoop consists of a circular pipe H), theupper end ll of which is substantially vertical and the lower end I3 iscurved in the fore-and-aft plane of the vessel. The lower end of thepipe is integral with a flange l2 which is secured to the bottom of theboat. This flange I2 is set obliquely to the lower end of the pipe, andthe open end of the pipe l3 in the neighbourhood of the flange is alsooblique to the axis of the pipe at this point, its obliquity beingsomewhat less than that of the flange. One edge M of the pipe therebyprojects below the flange l2 and the opposite side of the pipe at I5 isformed to an easy curve tangential to the face of the flange.

The part M of the pipe I 0 which extends below the flange I 2 and thereforms a cowl-like protuberance at the lower end l3 of the pipe isprovided with a streamlined fairing I 6, this being suitably curved bothfore-and-aft and laterally to ensure an easy flow of the water over it.Conveniently, the flange is of uniform thickness as shown in Figure 1 sothat the centre portion is dished near the edge I4 of the pipe.

It will be seen that with this arrangement the open end of the pipeprojects slightly below the bottom of the boat and in the case ofpressure scoops this opening faces forward and when it is to be used asa suction scoop it faces aft.

A grid or grating is provided across the lower open end of the pipe andis conveniently constituted by a number of bars I! lying in afore-andaft direction so as to offer a minimum resistance to the motionof the boat through the water. For this purpose also they may be taperedalong their length from the leading to the trailing edge, and for thispurpose the taper will be in opposite directions on suction and pressurescoops.

It will be appreciated that as the pipe meets the flange obliquely, itprovides an open mouth of large area and the pipe is shaped at its openend so as to provide a substantially rectangular opening. In addition,there is only a very small edge projecting into the water, but as thebottom surface of a high-speed boat, to which the scoop is fitted, is ahigh pressure surface, there is a suflicient pressure difference whenthe boat is in motion to cause circulation of the water through thepipe, and the cross-sectional area of the pipe is such as to provide therequired passage for the necessary quantity of water. The scoop thusoffers a minimum of resistance to the passage of the boat through thewater, which is an important feature in high-speed boats. In addition,the small extent of projection of the scoop below the boat bottom is ofadvantage when launching cradles are used, since the scoop is not likelyto be damaged if the boat should come to rest in a position other thanthat provided for by the spacing of the cradle members.

The upper end ll of the pipe may be screwthreaded or formed in any otherdesired manner according to the coupling which is to be used with it,and ordinarily a control valve will be provided in the piping adjacentto the scoop. This valve may be of any convenient type and may bearranged for remote control if so desired. The piping connected with thescoop will, of course, be varied according to the purposes for which thescoop is to be used.

I claim:

A water scoop for amotor boat comprising a pipe having a wall and aflange-like body integral therewith, the pipe wall defining a curvedconduit having an open end, the flange-like body disposed in an obliquerelation to the axis of the I conduit at its open end and the open endlying in the general plane of the flange-like body, one portion of thewall terminating in the general plane of said flange-like body and theopposite portion of said wall terminating out of said plane and thereforming a cowl-like protuberance having at one side thereof a fairingsurface tapering toward and terminating approximately in the plane ofthe flange-like body, a plurality of bars extending from the extremityof the protuberance across the open end of said conduit therebyconstituting a grid for said conduit preventing ingres of debris to saidprotuberance.

-HUBERT SCOTT-PAINE.

